Are old mercury dental fillings harmful?  I know mercury is poisonous, but I thought the kind used for dental fillings is supposed to be safe.  I have a lot of these fillings, put in many years ago.  Should I have them replaced?
D003723:Dental Amalgam / Q000009:adverse effects*; D003793:Dental Restoration, Permanent; D006801:Humans; D008630:Mercury Poisoning; D012449:Safety
D003723:Dental Amalgam